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安装TOMCAT后自带的jsp-examples不能运行而servlets-examples可以运行！





echo $CLASSPATH
/usr/lib/jvm/java-1.5.0-sun/lib:/usr/share/tomcat5.5/common/lib:.

echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/bin/X11:/usr/games:/home/aaron/bin:/usr/lib/jvm/java-1.5.0-sun/bin:/usr/share/tomcat5.5/bin:.


是何原因？

HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: org.apache.jasper.tagplugins.jstl.If
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:510)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:375)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

root cause

org.apache.jasper.JasperException: org.apache.jasper.tagplugins.jstl.If
org.apache.jasper.compiler.TagPluginManager.init(TagPluginManager.java:109)
org.apache.jasper.compiler.TagPluginManager.apply(TagPluginManager.java:51)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:189)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:295)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:276)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:264)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:563)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:303)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

root cause

java.lang.ClassNotFoundException: org.apache.jasper.tagplugins.jstl.If
java.net.URLClassLoader$1.run(URLClassLoader.java:200)
java.security.AccessController.doPrivileged(Native Method)
java.net.URLClassLoader.findClass(URLClassLoader.java:188)
java.lang.ClassLoader.loadClass(ClassLoader.java:306)
java.lang.ClassLoader.loadClass(ClassLoader.java:251)
java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
java.lang.Class.forName0(Native Method)
java.lang.Class.forName(Class.java:164)
org.apache.jasper.compiler.TagPluginManager.init(TagPluginManager.java:106)
org.apache.jasper.compiler.TagPluginManager.apply(TagPluginManager.java:51)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:189)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:295)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:276)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:264)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:563)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:303)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

note The full stack trace of the root cause is available in the Apache Tomcat/5.5 logs.

java.lang.ClassNotFoundException: org.apache.jasper.tagplugins.jstl.If

tag文件解析的原因？
还是没有需要的库？

SuperWar3Fan 写了：

java.lang.ClassNotFoundException: org.apache.jasper.tagplugins.jstl.If

tag文件解析的原因？
还是没有需要的库？

我不知道原因啊，可是自带的SERVLET EXAMPLE可以顺利运行的

奇怪！

在tomcat5.0中if.class的包路径是org.apache.jasper.tagplugins.jstl.If，在5.5中在tomcat5.0中if.class的包路径是org.apache.jasper.tagplugins.jstl.If，在5.5中org.apache.jasper.tagplugins.jstl.core.If，就多了一个“core”。
解决方法是修改目录/usr/share/tomcat5.5/webapps/jsp-examples/WEB-INF/ 下的tagplugins.xml文件，把类似于<plugin-class>org.apache.jasper.tagplugins.jstl.If</plugin-class>替换为<plugin-class>org.apache.jasper.tagplugins.jstl.core.If</plugin-class>